| 词汇 | notochord |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | notochord noun[ C ] anatomy specializeduk /ˈnəʊ.tə.kɔːd/ us /ˈnoʊ.t̬ə.kɔːrd/ a long, narrow structure of cells in the embryos(= animals that are developing in their mother's body) of humans and some animals that develops into the spine(= the line of bones down the centre of the back that provides support for the body): The notochord usually disappears before birth, though a few cells may remain embedded in the bones of the spine. The notochord is a temporary structure and forms a central axis, around which the segments of the vertebral column are developed. a long, narrow structure that can bend that is found in the body of some animals: The swim bladder was located below the notochord and above the digestive tract. The human notochord undergoes a development similar to that of the pig. From the mesoderm surrounding the neural tube and notochord, the skull and vertebral column, and the membranes of the brain and medulla spinalis are developed. After hatching, the larvae were classified according to the degree of notochord flexion. In the amphioxus, the notochord persists and forms the only representative of a skeleton in that animal. Substances & structures in the body abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus myosin navicular neuroendocrine neurohormonal neurohormone tendinous tendinum tendo tensor Th You can also find related words, phrases, and synonyms in the topics: Miscellaneous animal body parts Related wordnotochordal Examples of notochordnotochord This assay is based on the angle the notochord makes with a line drawn through the middle of the ear and eye. It is distinct from the mesoderm underneath the neural tube which is called the chordamesoderm and becomes the notochord. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The more rostral portion of the chondrocranium that lie anterior to the notochord constitutes the prechordal chondrocranium, and is derived primarily from neural crest-derived mesenchyme. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This process is also tied to the development of an anterior brain in the chordates from the notochord. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sonic hedgehog is the secreted protein which mediates signaling activities of the notochord and floor plate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The spinal cord is protected by the vertebral column and is above the notochord and the gastrointestinal tract is below it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, a few vertebrates, such as the sturgeon and the coelacanth retain the notochord into adulthood. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is now widely agreed that conodonts had large eyes, fins with fin rays, chevron-shaped muscles and a notochord. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The notochord disappears in the sclerotome (vertebral body) segments, but persists in the region of the intervertebral discs as the nucleus pulposus. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, a few fish have secondarily lost this anatomy, retaining the notochord into adulthood, such as the sturgeon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The notochord plays an integral role in the development of the neural tube. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The notochord, which is present in the young, is gradually replaced by cartilage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Instead of true vertebrae, they have a series of cartilaginous structures called arcualia arranged above the notochord. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The notochord becomes a canal within the embryo known as the neural canal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As the endoderm proliferates, the notochord is dragged into the middle of the developing embryo. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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